I've found a decent solution to this problem for those who have accidentally edited a simple sequence with clips interpreted as stereo, when they really need the audio split. It involves cutting all the clips back into the sequence, but it makes matching the in/out points a single click operation, and allows the editor to zoom through the entire sequence without touching the mouse. The drawback of this method is that it will restore the clips to their default parameters (levels, effects, etc.). If there are video effects, it's possible to keep the edited video and just replace the audio, but the link between the video and audio will be broken (but it can be relinked if necessary). Here's a step-by-step: 1) Interpret the relevant source clips as 2-channel mono. 2) Ensure all the clips that you want replaced are on the same video and audio tracks, and that there is one empty audio track immediately below the track with the stereo clips. 3) Set the following commands as conveniently-placed keyboard shortcuts (ideally all next to each other in this order): 1) Mark Clip, 2) Match Frame, 3) Overwrite, and 4) Select Next Panel. 4) Place the Source Monitor panel immediately to the left of the Timeline panel. 5) Make active only those timeline tracks that has the audio (or video and audio to replace both and maintain sync) of clips that you want replaced, and then put the timeline playhead at the first frame of the first clip that you want to replace the audio for. 6) Hit the shortcut for Mark Clip. This will mark in/out points around the first clip. 7) Hit the shortcut for Match Frame. This will bring the clip into the source monitor and mark the matching in/out points. 8) Hit the shortcut for Overwrite. This will replace the stereo clip with the 2-channel mono clip and automatically position the timeline playhead at the start of the next clip. 9) Hit the shortcut for Select Next Panel. This will activate the timeline panel. 10) If all the clips are back-to-back in the timeline, just repeat the four shortcuts (steps 6-9) over and over until all the clips have been replaced.
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